Estimating interaction strengths in nature: experimental support for an observational approach

Ecology
Mark Novak

Abstract

The complexity of food webs poses a significant hurdle for our growing understanding of the structure and dynamics of ecological communities. Empirical methods that measure the per capita strengths of trophic species interactions offer a means to identify keystone species and bridge mathematical models and data to synthesize our knowledge of population dynamics and predator feeding behaviors. Many such methods have been proposed, but few have seen independent validation of their estimates or underlying assumptions. This is particularly so with respect to the nonlinear functional responses by which predators often respond to their prey. Here I describe an empirical test of a recently proposed observational method for estimating the nonlinear strength of predator-prey interactions in the field. By applying the method to two populations of a predatory intertidal whelk, Haustrum scobina, I estimated its per capita attack rates on all nine of its observed prey species. These spanned two orders of magnitude in per capita strength. Concurrent experimental manipulations of the two predator populations provided population time series for the response of a mussel prey species, Xenostrobus pulex. I obtained independent interaction strengt...Continue Reading

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Citations

Apr 23, 2015·Proceedings of the National Academy of Sciences of the United States of America·Elisa BenincàJef Huisman
Mar 5, 2015·Ecology Letters·Diego P VázquezFernanda S Valdovinos
May 10, 2017·Ecology Letters·Mark NovakIsaac D Shepard
Apr 21, 2017·Oecologia·Christopher WolfAlix I Gitelman
Aug 2, 2019·Scientific Reports·Torbjörn SäterbergBo Ebenman
Sep 9, 2017·Scientific Reports·Tomas Jonsson
Jan 1, 2021·Ecology Letters·Mark Novak, Daniel B Stouffer
Jan 7, 2021·Ecology Letters·Daniel B Stouffer, Mark Novak
Jun 14, 2021·Ecology Letters·Alexis D SynodinosJosé M Montoya

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